package com.atguigu.gulimall.member.config;

import feign.RequestInterceptor;
import feign.RequestTemplate;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;

@Configuration
public class GuliFeignConfig {

    /**
     * 设置feign远程调用属性，使用feign远程调用时添加cookie信息
     * @return 请求拦截器
     */
    @Bean
    public RequestInterceptor requestInterceptor() {

        return new RequestInterceptor() {
            @Override
            public void apply(RequestTemplate requestTemplate) {
                // 1 从 requestContextHolder拿到刚进来的请求， 其原理也是ThreadLocal 相同线程类内部共享数据
                ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();

                if (attributes != null) {
                    HttpServletRequest request = attributes.getRequest();// 老请求
                    // 同步请求头数据，cookie
                    String cookie = request.getHeader("Cookie");
                    // 给新请求同步老请求的cookie
                    requestTemplate.header("Cookie", cookie);
                }
            }
        };
    }
}
